Abigail Hernandez, 15, went missing on Oct. 9 and was last seen walking home from Kennet High School.

The vigil will be held from 6 p.m. until 10 p.m.

Investigators are asking people to change their Facebook cover and profile photo to a specific set of photos.

Participants are also encouraged to write one post each hour asking for tips and information.

Organizers have three suggested posts:

Abigail Hernandez, age 15, went missing from a very public place on October 9th at 2:30PM in North Conway, NH. To this day, there is very little information on her whereabouts. Whether you know her or her family or you have “heard something” about her, and especially in her activities in the days leading up to her disappearance, please call 1-800-CALL-FBI or submit a tip at tips.fbi.gov There is a $20,000 reward for information #bringabbyhome–Abigail Hernandez is missing. She is 15 and disappeared from North Conway, NH on October 9th. We need your help finding her. If you have seen this girl, please contact 1-800-CALL-FBI. No piece of information is too small or insignificant to be shared and YOUR TIP COULD BE THE DIFFERENCE IN FINDING HER. There is a $20,000 reward for information. #bringabbyhome–

Abby Hernandez disappeared without a trace on Oct 9th from North Conway, NH. Any information about her, no matter how small, should be reported to 1-800-CALL-FBI. If you have a tip and never bothered to report it because you think someone else did, please make the call. #bringabbyhome

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